Review the evidence signals before interviewing. Then use the anchored descriptions—not instinct alone—to choose the score that best matches each answer.
01
Evaluation factor
Hands-on competence
35% weight
Check hands-on volume: roof types worked (slate, pantile, standing seam, ground mount), string sizing and DC cable runs, inverter and battery commissioning (SolarEdge, Fronius, GivEnergy), plus 18th Edition and MCS experience.
Evidence to listen for
Names the equipment, materials, and tolerances they work to
Can describe a job start to finish without hand-waving the hard parts
Holds the tickets, licences, or certifications the work requires, and they are current
Knows what they are not qualified to touch
Five-point scoring guide
1
Poor
Cannot describe the work concretely; lacks required tickets or licences.
2
Needs Improvement
Basic familiarity; needs supervision on routine tasks.
3
Satisfactory
Competent on standard work; slower or unsure on unfamiliar jobs.
4
Very Good
Skilled and independent across the normal range of the role.
5
Excellent
Names array sizes, mounting systems and inverter brands installed, and describes commissioning tests and G98/G99 paperwork from memory.
02
Evaluation factor
Safety discipline
30% weight
Probe working at height discipline: harness and anchor use, scaffold or tower sign-off (PASMA, IPAF), DC isolation before panel connection, arc flash awareness, and refusing unsafe roof or weather conditions.
Evidence to listen for
Treats procedure as protection rather than paperwork
Can describe a time they stopped work and why
Knows the specific hazards of this trade and the controls for each
Reports near misses instead of hiding them
Five-point scoring guide
1
Poor
Casual about safety; describes shortcuts with pride.
2
Needs Improvement
Follows procedure when watched; cannot name the hazards that matter.
3
Satisfactory
Sound safety habits; less certain on unfamiliar hazards.
4
Very Good
Safety is instinctive; can describe stopping work over a real concern.
5
Excellent
Recounts a specific job halted for wind, scaffold defect or live DC risk, and cites their isolation and lock-off sequence.
03
Evaluation factor
Fault finding
20% weight
Test diagnostic method on underperforming arrays: string voltage and insulation resistance readings, IV curve or clamp meter checks, shading and optimiser faults, earth faults, and inverter error codes traced to root cause.
Evidence to listen for
Has a method for narrowing a fault rather than swapping parts
Reads schematics, manuals, or error codes and acts on them
Knows when to escalate rather than guess
Can describe a fault that took real work to find
Five-point scoring guide
1
Poor
Parts-swapper; no diagnostic method.
2
Needs Improvement
Fixes symptoms; cannot explain how they found the cause.
3
Satisfactory
Solid on familiar faults; less structured on new ones.
4
Very Good
Clear systematic method with a real hard-fault story.
5
Excellent
Walks a real underperformance callout end to end, quoting meter readings and the fault found rather than guessing at symptoms.
04
Evaluation factor
Reliability and conduct
15% weight
Assess conduct on customer roofs and in loft spaces: timekeeping across scheduled installs, van stock and tool control, tidy cable management, handover packs, and DNO or MCS documentation submitted on time.
Evidence to listen for
Turns up, on time, prepared
Handles shift work, callouts, or travel as the role requires
Documents work so the next person can pick it up
Deals with customers or site staff professionally
Five-point scoring guide
1
Poor
Unreliable attendance; unprofessional on site.
2
Needs Improvement
Inconsistent; documentation is an afterthought.
3
Satisfactory
Dependable; paperwork is adequate.
4
Very Good
Consistently reliable, documents well, professional with customers.
5
Excellent
Shows evidence of completed jobs signed off first time, clean documentation, and references from installers or homeowners.
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